Children in low- and middle-income countries are among those most at risk to the health impacts of climate change, not least through undernutrition, which has serious long-lasting consequences for individuals and society and may undermine decades of global health gains. Attribution science can drive urgent societal action. However, it is currently limited in scope, focusing mostly on heat and adult populations in high-income settings, largely because of the lack of accessible tools, methods, data, and interdisciplinary expertise. To fill this research gap, this project will derive multiple climate attribution datasets, advance process-based crop models, and apply econometric, epidemiological and health impact assessment methods on underused data sources in order to quantify the already occurring impacts of climate change on child health. These will be integrated into an interactive digital open source tool (MILK). MILK will be co-designed in a series of workshops with the interdisciplinary project team and scientists and stakeholders from West Africa, Central/Eastern Africa, and South Asia. The attribution results will be set into the context of mitigation and adaptation options and complemented with an intergenerational justice perspective.The involvement of policy makers will be ensured throughout the project to advance the policy integration of the generated evidence.